Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Pneumatic tire and method of producing the same

a technology of pneumatic tires and pneumatic cylinders, which is applied in the field of pneumatic tires, can solve the problems of lowering the breaking strength to air pressure, the difficulty of high maintaining the ride comfort and slip resistance, and the difficulty of high maintaining the slip resistan

Inactive Publication Date: 2004-07-01
BRIDGESTONE CORP
View PDF7 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a pneumatic tire for a motorcycle that improves steering stability and other performances by using a combination of two different cords in the spiral belt. The use of two different cords allows for an appropriate end count, providing rigidity without causing problems such as lowering of breaking strength to air pressure or reducing gripping force. The two different cords can be arranged in a continuous or discontinuous manner, and can be made from resin or inorganic materials. The technical effects of the invention include improved steering stability, high-speed stability, light feeling, and cornering power in the handling, as well as maintaining safety and puncture resistance under inflation of an air pressure at a higher level.

Problems solved by technology

In the spiral belt comprised of only the steel cord, the rigidity becomes too high and hence it is difficult to highly maintain the ride comfort and the slip resistance.
When the end count is merely reduced in the spiral belt comprised of only the steel cord, however, there are caused troubles such as lowering of breaking strength to air pressure, lowering of puncture resistance, lowering of fatigue resistances of the tread rubber and the carcass ply against repetitive bending due to the lowering of bending rigidity in a section direction
In the spiral belt comprised of only the reinforcing fiber cord, the rigidity is lacking and an amplitude of shimmy behavior becomes easily large and hence it is difficult to maintain the high-speed stability at a higher level during the high-speed running and hold the light feeling and responsibility of the handling and maintain the gripping force at a higher level during the cornering and as a result, it is feared that the steering stability can not sufficiently be ensured.
However, when the end count is increased more than necessary or the other members are added, it is difficult to reduce the tire weight and also the gripping force lowers due to the lowering of shearing rigidity accompanied with the lamination.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pneumatic tire and method of producing the same
  • Pneumatic tire and method of producing the same
  • Pneumatic tire and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

example 2 example 1

Hydraulic burst pressure (KPa) 250 150 250 High-speed stability 100 120 120 Light feeling and responsibility 100 120 120 Gripping force in cornering 100 110 120 Ride comfort 100 80 90

[0055] As seen from Table 1, when the tire of Example 1 is compared with the tire of Conventional Example 1, the hydraulic burst pressure is equal to and the ride comfort is somewhat low, but the other running performances are higher than those of the conventional tire. And also, the running performances in the tire of Example 1 are equal to or more than those of the tire of Conventional Example 2.

[0056] On the other hand, each of these tires is subjected to a running test by mounting onto a motorcycle as a front tire in addition to a hydraulic burst pressure test to obtain results as shown in Table 2. In this case, a radial tire comprising a circumferential belt of KEVLAR is used as a rear tire.

2 TABLE 2 Conventional Conventional Example 1 Example 2 Example 1 Example 2 Hydraulic burst 250 150 250 220 p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensionaaaaaaaaaa
initial tensionaaaaaaaaaa
cord angleaaaaaaaaaa
Login to View More

Abstract

A pneumatic tire comprises a spiral belt formed by spirally winding a cord(s) along a circumferential direction of a torus tread, wherein the spiral belt is comprised of at least one layer constructed with a combination of two different cords each having an initial tension of not less than 50 cN / cord.

Description

CROSS REFERENCE TO RELATED APPLICATION(S)[0001] This is a divisional of application Ser. No. 09 / 934,580, filed Aug. 23, 2001; the disclosure of which is incorporated herein by reference.[0002] 1. Field of the Invention[0003] This invention relates to a pneumatic tire having an improved steering stability and a method of producing such a pneumatic tire, and more particularly to a front tire and a rear tire for a motorcycle and a method of producing the same.[0004] 2. Description of Related Art[0005] In the conventional front and rear tires as a tire for a motorcycle or the like, a spiral belt formed by spirally winding a cord(s) on an outer circumference of a carcass is recently used as a belt structure. In this case, the belt is constructed by one kind of the cord. In general, there are known a spiral belt comprised of only a steel cord, a spiral belt comprised of only a reinforcing fiber cord made of a resin material or the like.[0006] In the spiral belt comprised of only the steel...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): B29D30/70B60C9/00B60C9/20B60C9/18B60C9/22
CPCB60C9/2204B29D30/1628Y10T152/10783B60C2009/2029B29D30/70B60C2200/10B60C2009/2209
Inventor NAKAMURA, TSUTOMU
Owner BRIDGESTONE CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com